We demonstrate a simple one-step method for synthesizing noble metal nanoparticles embedded free standing polydimethylsiloxane (PDMS) composite films. The process involves preparing a homogenous mixture of metal salt, silicone elastomer and the curing agent (hardener) followed by curing. In the process, the hardener reduces metal salt and forms nanoparticles. This in situ method avoids the use of any external reducing agent or stabilizing agent and leads to a uniform distribution of nanoparticles in the polymer matrix. The films were characterized using UV/Vis spectroscopy, transmission electron microscopy and X-ray photoemission spectroscopy. These metal nanoparticle-PDMS films show enhanced antimicrobial and mechanical properties. They could be used for a number of applications such as catalysis, optical and biomedical devices and gas separation membranes.